drivers/infiniband/hw/mthca/mthca_mad.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/string.h>
  36 #include <linux/slab.h>
  37
  38 #include <rdma/ib_verbs.h>
  39 #include <rdma/ib_mad.h>
  40 #include <rdma/ib_smi.h>
  41
  42 #include "mthca_dev.h"
  43 #include "mthca_cmd.h"
  44
  45 enum {
  46         MTHCA_VENDOR_CLASS1 = 0x9,
  47         MTHCA_VENDOR_CLASS2 = 0xa
  48 };
  49
  50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
  51 {
  52         struct ib_port_attr *tprops = NULL;
  53         int                  ret;
  54
  55         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
  56         if (!tprops)
  57                 return -ENOMEM;
  58
  59         ret = ib_query_port(&dev->ib_dev, port_num, tprops);
  60         if (ret) {
  61                 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
  62                        ret, dev->ib_dev.name, port_num);
  63                 goto out;
  64         }
  65
  66         dev->rate[port_num - 1] = tprops->active_speed *
  67                                   ib_width_enum_to_int(tprops->active_width);
  68
  69 out:
  70         kfree(tprops);
  71         return ret;
  72 }
  73
  74 static void update_sm_ah(struct mthca_dev *dev,
  75                          u8 port_num, u16 lid, u8 sl)
  76 {
  77         struct ib_ah *new_ah;
  78         struct rdma_ah_attr ah_attr;
  79         unsigned long flags;
  80
  81         if (!dev->send_agent[port_num - 1][0])
  82                 return;
  83
  84         memset(&ah_attr, 0, sizeof ah_attr);
  85         rdma_ah_set_dlid(&ah_attr, lid);
  86         rdma_ah_set_sl(&ah_attr, sl);
  87         rdma_ah_set_port_num(&ah_attr, port_num);
  88
  89         new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  90                                 &ah_attr);
  91         if (IS_ERR(new_ah))
  92                 return;
  93
  94         spin_lock_irqsave(&dev->sm_lock, flags);
  95         if (dev->sm_ah[port_num - 1])
  96                 rdma_destroy_ah(dev->sm_ah[port_num - 1]);
  97         dev->sm_ah[port_num - 1] = new_ah;
  98         spin_unlock_irqrestore(&dev->sm_lock, flags);
  99 }
 100
 101 /*
 102  * Snoop SM MADs for port info and P_Key table sets, so we can
 103  * synthesize LID change and P_Key change events.
 104  */
 105 static void smp_snoop(struct ib_device *ibdev,
 106                       u8 port_num,
 107                       const struct ib_mad *mad,
 108                       u16 prev_lid)
 109 {
 110         struct ib_event event;
 111
 112         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 113              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 114             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 115                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 116                         struct ib_port_info *pinfo =
 117                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 118                         u16 lid = be16_to_cpu(pinfo->lid);
 119
 120                         mthca_update_rate(to_mdev(ibdev), port_num);
 121                         update_sm_ah(to_mdev(ibdev), port_num,
 122                                      be16_to_cpu(pinfo->sm_lid),
 123                                      pinfo->neighbormtu_mastersmsl & 0xf);
 124
 125                         event.device           = ibdev;
 126                         event.element.port_num = port_num;
 127
 128                         if (pinfo->clientrereg_resv_subnetto & 0x80) {
 129                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 130                                 ib_dispatch_event(&event);
 131                         }
 132
 133                         if (prev_lid != lid) {
 134                                 event.event    = IB_EVENT_LID_CHANGE;
 135                                 ib_dispatch_event(&event);
 136                         }
 137                 }
 138
 139                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 140                         event.device           = ibdev;
 141                         event.event            = IB_EVENT_PKEY_CHANGE;
 142                         event.element.port_num = port_num;
 143                         ib_dispatch_event(&event);
 144                 }
 145         }
 146 }
 147
 148 static void node_desc_override(struct ib_device *dev,
 149                                struct ib_mad *mad)
 150 {
 151         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 152              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 153             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 154             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 155                 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 156                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
 157                        IB_DEVICE_NODE_DESC_MAX);
 158                 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 159         }
 160 }
 161
 162 static void forward_trap(struct mthca_dev *dev,
 163                          u8 port_num,
 164                          const struct ib_mad *mad)
 165 {
 166         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 167         struct ib_mad_send_buf *send_buf;
 168         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 169         int ret;
 170         unsigned long flags;
 171
 172         if (agent) {
 173                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 174                                               IB_MGMT_MAD_DATA, GFP_ATOMIC,
 175                                               IB_MGMT_BASE_VERSION);
 176                 if (IS_ERR(send_buf))
 177                         return;
 178                 /*
 179                  * We rely here on the fact that MLX QPs don't use the
 180                  * address handle after the send is posted (this is
 181                  * wrong following the IB spec strictly, but we know
 182                  * it's OK for our devices).
 183                  */
 184                 spin_lock_irqsave(&dev->sm_lock, flags);
 185                 memcpy(send_buf->mad, mad, sizeof *mad);
 186                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 187                         ret = ib_post_send_mad(send_buf, NULL);
 188                 else
 189                         ret = -EINVAL;
 190                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 191
 192                 if (ret)
 193                         ib_free_send_mad(send_buf);
 194         }
 195 }
 196
 197 int mthca_process_mad(struct ib_device *ibdev,
 198                       int mad_flags,
 199                       u8 port_num,
 200                       const struct ib_wc *in_wc,
 201                       const struct ib_grh *in_grh,
 202                       const struct ib_mad_hdr *in, size_t in_mad_size,
 203                       struct ib_mad_hdr *out, size_t *out_mad_size,
 204                       u16 *out_mad_pkey_index)
 205 {
 206         int err;
 207         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 208         u16 prev_lid = 0;
 209         struct ib_port_attr pattr;
 210         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 211         struct ib_mad *out_mad = (struct ib_mad *)out;
 212
 213         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 214                          *out_mad_size != sizeof(*out_mad)))
 215                 return IB_MAD_RESULT_FAILURE;
 216
 217         /* Forward locally generated traps to the SM */
 218         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 219             slid == 0) {
 220                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 221                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 222         }
 223
 224         /*
 225          * Only handle SM gets, sets and trap represses for SM class
 226          *
 227          * Only handle PMA and Mellanox vendor-specific class gets and
 228          * sets for other classes.
 229          */
 230         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 231             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 232                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 233                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 234                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 235                         return IB_MAD_RESULT_SUCCESS;
 236
 237                 /*
 238                  * Don't process SMInfo queries or vendor-specific
 239                  * MADs -- the SMA can't handle them.
 240                  */
 241                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 242                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 243                      IB_SMP_ATTR_VENDOR_MASK))
 244                         return IB_MAD_RESULT_SUCCESS;
 245         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 246                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 247                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 248                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 249                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 250                         return IB_MAD_RESULT_SUCCESS;
 251         } else
 252                 return IB_MAD_RESULT_SUCCESS;
 253         if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 254              in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 255             in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
 256             in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 257             !ib_query_port(ibdev, port_num, &pattr))
 258                 prev_lid = pattr.lid;
 259
 260         err = mthca_MAD_IFC(to_mdev(ibdev),
 261                             mad_flags & IB_MAD_IGNORE_MKEY,
 262                             mad_flags & IB_MAD_IGNORE_BKEY,
 263                             port_num, in_wc, in_grh, in_mad, out_mad);
 264         if (err == -EBADMSG)
 265                 return IB_MAD_RESULT_SUCCESS;
 266         else if (err) {
 267                 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
 268                 return IB_MAD_RESULT_FAILURE;
 269         }
 270
 271         if (!out_mad->mad_hdr.status) {
 272                 smp_snoop(ibdev, port_num, in_mad, prev_lid);
 273                 node_desc_override(ibdev, out_mad);
 274         }
 275
 276         /* set return bit in status of directed route responses */
 277         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 278                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 279
 280         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 281                 /* no response for trap repress */
 282                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 283
 284         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 285 }
 286
 287 static void send_handler(struct ib_mad_agent *agent,
 288                          struct ib_mad_send_wc *mad_send_wc)
 289 {
 290         ib_free_send_mad(mad_send_wc->send_buf);
 291 }
 292
 293 int mthca_create_agents(struct mthca_dev *dev)
 294 {
 295         struct ib_mad_agent *agent;
 296         int p, q;
 297         int ret;
 298
 299         spin_lock_init(&dev->sm_lock);
 300
 301         for (p = 0; p < dev->limits.num_ports; ++p)
 302                 for (q = 0; q <= 1; ++q) {
 303                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 304                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 305                                                       NULL, 0, send_handler,
 306                                                       NULL, NULL, 0);
 307                         if (IS_ERR(agent)) {
 308                                 ret = PTR_ERR(agent);
 309                                 goto err;
 310                         }
 311                         dev->send_agent[p][q] = agent;
 312                 }
 313
 314
 315         for (p = 1; p <= dev->limits.num_ports; ++p) {
 316                 ret = mthca_update_rate(dev, p);
 317                 if (ret) {
 318                         mthca_err(dev, "Failed to obtain port %d rate."
 319                                   " aborting.\n", p);
 320                         goto err;
 321                 }
 322         }
 323
 324         return 0;
 325
 326 err:
 327         for (p = 0; p < dev->limits.num_ports; ++p)
 328                 for (q = 0; q <= 1; ++q)
 329                         if (dev->send_agent[p][q])
 330                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 331
 332         return ret;
 333 }
 334
 335 void mthca_free_agents(struct mthca_dev *dev)
 336 {
 337         struct ib_mad_agent *agent;
 338         int p, q;
 339
 340         for (p = 0; p < dev->limits.num_ports; ++p) {
 341                 for (q = 0; q <= 1; ++q) {
 342                         agent = dev->send_agent[p][q];
 343                         dev->send_agent[p][q] = NULL;
 344                         ib_unregister_mad_agent(agent);
 345                 }
 346
 347                 if (dev->sm_ah[p])
 348                         rdma_destroy_ah(dev->sm_ah[p]);
 349         }
 350 }